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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Thomas E. Dickey 2008 *
31 ****************************************************************************/
34 * tabs.c -- set terminal hard-tabstops
38 #include <progs.priv.h>
40 MODULE_ID("$Id: tabs.c,v 1.25 2012/11/18 01:21:47 tom Exp $")
42 static void usage(void) GCC_NORETURN;
50 ExitProgram(EXIT_FAILURE);
60 do_tabs(int *tab_list)
66 while ((stop = *tab_list++) > 0) {
68 while (last++ < stop) {
74 if (stop <= max_cols) {
75 tputs(tparm(set_tab, stop), 1, putch);
85 decode_tabs(const char *tab_list)
87 int *result = typeCalloc(int, strlen(tab_list) + (unsigned) max_cols);
94 failed("decode_tabs");
96 while ((ch = *tab_list++) != '\0') {
97 if (isdigit(UChar(ch))) {
100 } else if (ch == ',') {
101 result[n] = value + prior;
102 if (n > 0 && result[n] <= result[n - 1]) {
104 "tab-stops are not in increasing order: %d %d\n",
105 value, result[n - 1]);
113 } else if (ch == '+') {
115 prior = result[n - 1];
121 * If there is only one value, then it is an option such as "-8".
123 if ((n == 0) && (value > 0)) {
125 while (n < max_cols - 1) {
132 * Add the last value, if any.
134 result[n++] = value + prior;
142 print_ruler(int *tab_list)
148 /* first print a readable ruler */
149 for (n = 0; n < max_cols; n += 10) {
150 int ch = 1 + (n / 10);
152 _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer))
157 printf("%.*s", ((max_cols - n) > 10) ? 10 : (max_cols - n), buffer);
161 /* now, print '*' for each stop */
162 for (n = 0, last = 0; (tab_list[n] > 0) && (last < max_cols); ++n) {
164 while (++last < stop) {
165 if (last <= max_cols) {
171 if (last <= max_cols) {
178 while (++last <= max_cols)
184 * Write an '*' on each tabstop, to demonstrate whether it lines up with the
188 write_tabs(int *tab_list)
192 while ((stop = *tab_list++) > 0 && stop <= max_cols) {
193 fputs((stop == 1) ? "*" : "\t*", stdout);
195 /* also show a tab _past_ the stops */
197 fputs("\t+", stdout);
202 * Trim leading/trailing blanks, as well as blanks after a comma.
203 * Convert embedded blanks to commas.
206 trimmed_tab_list(const char *source)
208 char *result = strdup(source);
212 for (j = k = last = 0; result[j] != 0; ++j) {
213 ch = UChar(result[j]);
217 } else if (isdigit(last) || last == ',') {
220 } else if (ch == ',') {
224 result[k++] = (char) last;
225 result[k++] = (char) ch;
235 comma_is_needed(const char *source)
240 size_t len = strlen(source);
242 result = (source[len - 1] != ',');
250 * Add a command-line parameter to the tab-list. It can be blank- or comma-
251 * separated (or a mixture). For simplicity, empty tabs are ignored, e.g.,
254 * are treated the same.
257 add_to_tab_list(char **append, const char *value)
259 char *result = *append;
260 char *copied = trimmed_tab_list(value);
262 if (copied != 0 && *copied != '\0') {
263 const char *comma = ",";
264 size_t need = 1 + strlen(copied);
268 else if (!comma_is_needed(*append))
271 need += strlen(comma);
273 need += strlen(*append);
275 result = malloc(need);
277 failed("add_to_tab_list");
281 _nc_STRCPY(result, *append, need);
284 _nc_STRCAT(result, comma, need);
285 _nc_STRCAT(result, copied, need);
293 * Check for illegal characters in the tab-list.
296 legal_tab_list(const char *program, const char *tab_list)
300 if (tab_list != 0 && *tab_list != '\0') {
301 if (comma_is_needed(tab_list)) {
303 for (n = 0; tab_list[n] != '\0'; ++n) {
304 ch = UChar(tab_list[n]);
305 if (!(isdigit(ch) || ch == ',' || ch == '+')) {
307 "%s: unexpected character found '%c'\n",
314 fprintf(stderr, "%s: trailing comma found '%s'\n", program, tab_list);
318 fprintf(stderr, "%s: no tab-list given\n", program);
327 static const char *msg[] =
329 "Usage: tabs [options] [tabstop-list]"
333 ," -8 set tabs to standard interval"
334 ," -a Assembler, IBM S/370, first format"
335 ," -a2 Assembler, IBM S/370, second format"
336 ," -c COBOL, normal format"
337 ," -c2 COBOL compact format"
338 ," -c3 COBOL compact format extended"
339 ," -d debug (show ruler with expected/actual tab positions)"
341 ," -n no-op (do not modify terminal settings)"
344 ," -u UNIVAC 1100 Assembler"
345 ," -T name use terminal type 'name'"
347 ,"A tabstop-list is an ordered list of column numbers, e.g., 1,11,21"
348 ,"or 1,+10,+10 which is the same."
353 for (n = 0; n < SIZEOF(msg); ++n) {
354 fprintf(stderr, "%s\n", msg[n]);
356 ExitProgram(EXIT_FAILURE);
360 main(int argc, char *argv[])
362 int rc = EXIT_FAILURE;
366 NCURSES_CONST char *term_name = 0;
368 const char *tab_list = 0;
370 if ((term_name = getenv("TERM")) == 0)
371 term_name = "ansi+tabs";
373 /* cannot use getopt, since some options are two-character */
374 for (n = 1; n < argc; ++n) {
375 char *option = argv[n];
378 while ((ch = *++option) != '\0') {
383 tab_list = "1,10,16,36,72";
384 /* Assembler, IBM S/370, first format */
387 tab_list = "1,10,16,40,72";
388 /* Assembler, IBM S/370, second format */
397 tab_list = "1,8,12,16,20,55";
398 /* COBOL, normal format */
401 tab_list = "1,6,10,14,49";
402 /* COBOL compact format */
405 tab_list = "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67";
406 /* COBOL compact format extended */
412 case 'd': /* ncurses extension */
416 tab_list = "1,7,11,15,19,23";
419 case 'n': /* ncurses extension */
423 tab_list = "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61";
427 tab_list = "1,10,55";
431 tab_list = "1,12,20,44";
432 /* UNIVAC 1100 Assembler */
436 if (*++option != '\0') {
439 term_name = argv[n++];
441 option += ((int) strlen(option)) - 1;
444 if (isdigit(UChar(*option))) {
450 option += ((int) strlen(option)) - 1;
456 while ((ch = *++option) != '\0') {
460 * The "+mXXX" option is unimplemented because only the long-obsolete
461 * att510d implements smgl, which is needed to support
466 /* special case of relative stops separated by spaces? */
467 if (option == argv[n] + 1) {
468 tab_list = add_to_tab_list(&append, argv[n]);
476 if (tab_list != (const char *) append) {
477 /* one of the predefined options was used */
482 tab_list = add_to_tab_list(&append, option);
487 setupterm(term_name, STDOUT_FILENO, (int *) 0);
489 max_cols = (columns > 0) ? columns : 80;
491 if (!VALID_STRING(clear_all_tabs)) {
493 "%s: terminal type '%s' cannot reset tabs\n",
495 } else if (!VALID_STRING(set_tab)) {
497 "%s: terminal type '%s' cannot set tabs\n",
499 } else if (legal_tab_list(argv[0], tab_list)) {
500 int *list = decode_tabs(tab_list);
503 tputs(clear_all_tabs, 1, putch);
510 printf("tabs %s\n", tab_list);
517 printf("tabs %s\n", tab_list);